Attics can get very hot and humid in the summer.
Normal moisture levels in attics.
Humidity settings are another issue that can make or break the performance of your heating and cooling systems and your attic ventilation.
Why is this important to understand.
Even in winter condensation can be problem if the attic is too warm.
If looking at an attic at a 110 degree f temperature and 80 relative humidity the wood moisture content would correlate to a 14 7 wood moisture content.
The acceptable moisture levels of wood and lumber are in the range of 6 to 8 for interior and 9 to 14 for exterior wood or for building envelope components within constructed assemblies.
Fresh cut trees can have a wood moisture content over 200 while completely dried wood will have a wood moisture content of 0.
Outside air moves into the attic leaves its.
By adding moisture to the lower floor you increase the partial pressure of the water vapor which pushes it to areas of lower vapor pressure like the attic.
So they equalize pretty quickly.
The average rh of the environment where the wood will be used.
Wood in buildings usually has a wood moisture content of 5 to 15.
Wood moisture content is the weight of water in a piece of wood expressed as a percentage of oven dry weight of wood.
The short answer to this very involved question and the pages of temperature and humidity level data you sent is yes there is a risk that moisture from humid air in your attic will condense on.
This creates the perfect environment for mold and mildew to form.
The wood s final use.
If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck.
If you raise the attic temperature the rh in both places would be the same.
The bd 2100 s drywall moisture meter readings are accurate in gypsum to moisture content percentages as low as 0 2 and as high as 50.
The difference in the two spaces is the dry bulb temperature.
This easy to follow diy guide will show you how to monitor your attic s heat and moisture levels so you can afford these problems.
Mostly because there are many misunderstandings of what is an appropriate level for wood moisture levels especially in the crawlspace.
The acceptable moisture content in wood depends on two factors.
In the wood scale the meter can detect moisture accurately over a range of 6 mc to 40 mc.
